According to API 650, how far above the surrounding ground surface should the tank bottom be constructed?

• A. 6 inches
• B. 1 foot
• C. 2 feet
• D. 3 feet

Answer: (B)

In the context of API 650, the recommended tank bottom elevation relative to the surrounding ground surface is designed primarily for safety, operational efficiency, and environmental protection. A tank bottom constructed 1 foot above the surrounding ground level helps ensure adequate drainage and minimizes the risk of water accumulation which can lead to corrosion or structural issues.

Additionally, this elevation helps prevent contaminants and debris from entering the tank system, thereby maintaining the integrity of the stored oil and reducing potential risks associated with environmental spills.

While other potential elevations mentioned—like 2 feet, 3 feet, or 6 inches—may have specific applications or limitations, the 1-foot standard reflects a balanced consideration of effective containment principles and practical site management.